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Detecting peatland drains with Object Based Image Analysis and Geoeye-1 imagery.

J Connolly1, N M Holden2

  • 1School of History and Geography, Dublin City University, St. Patrick's Campus, Drumcondra, Dublin 9, Ireland. john.b.connolly@dcu.ie.

Carbon Balance and Management
|April 18, 2017
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Summary

Mapping peatland drains using object-based image analysis (OBIA) is accurate and cost-effective. This method precisely locates drains, aiding in carbon cycle management and reducing greenhouse gas emissions.

Keywords:
Carbon dynamicsCost effectiveDrain detectionEcosystem servicesGIS/Object based image analysisPeatlandsRemote sensingSatellite imagery

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Area of Science:

  • Environmental Science
  • Remote Sensing
  • Ecology

Background:

  • Peatlands are crucial for the global carbon cycle, offering vital ecosystem services like carbon sequestration.
  • Drainage disrupts these services, and accurately mapping peatland drains is challenging and costly.
  • The spatial extent of drains is often unknown, hindering effective peatland management.

Purpose of the Study:

  • To develop and assess an object-based image analysis (OBIA) method for mapping peatland drains.
  • To determine the accuracy and cost-effectiveness of OBIA compared to traditional methods.
  • To utilize drain maps for assessing carbon flux impacts and management strategies.

Main Methods:

  • Object-based image analysis (OBIA) applied to very high-resolution satellite imagery (Geoeye-1).
  • Accuracy assessment using error matrix (overall accuracy, kappa statistic) and completeness, correctness, and quality (CCQ).
  • Cost comparison with manual digitisation and field surveys; drain maps used for carbon flux estimation.

Main Results:

  • OBIA successfully detected nearly 500 km of drains with high accuracy (overall accuracy 94%, kappa 0.66).
  • Sub-area accuracy ranged from 95-97%, with CCQ scores of 85%, 85%, and 71%.
  • OBIA was at least 55% more cost-effective than field surveys or manual digitisation; mapped drains reduced CO2 flux estimates by 19%.

Conclusions:

  • OBIA provides an accurate and cost-effective method for mapping fine-scale peatland drains over large areas.
  • Accurate drain mapping is essential for understanding peatland carbon dynamics and informing climate change mitigation strategies.
  • This method supports Annex 1 parties in accounting for greenhouse gas emissions and developing effective drain-blocking strategies globally.